Fathers play a unique and important role in their children's development, a new report shows.

Just in time for Father's Day, the American Academy of Pediatrics report says U.S. dads are more involved in child care than ever before. At the same time, studies show that those involved fathers have important effects on kids' health and well-being.

"From everyone's standpoint, the more we can do to encourage fathers' involvement, the better," said Dr. Michael Yogman, a co-author of the report.

'[Dads] often encourage their children to explore and take risks, while mothers offer stability and safety. There's room for both'- Dr. Michael Yogman

"It's beneficial for kids. Fathers aren't just 'redundant,' doing the same things as mothers do," added Yogman, who chairs the academy's committee on psychosocial aspects of child and family health.

Studies have found that older kids with involved fathers tend to have fewer depression symptoms and behavioural problems, and lower rates of teen pregnancy.

When it comes to young children, fathers can have effects on language development and mental health, according to the academy. Research has shown that dads are more likely to use new words when they talk to their babies and preschoolers, for example.

"It's a stereotype, but it's true that fathers do more of the rough-and-tumble style of play," Yogman said. "They often encourage their children to explore and take risks, while mothers offer stability and safety. There's room for both."

Research suggests that preschoolers tend to have fewer mental health symptoms — like anxiety or aggression — when their fathers are regularly involved in playtime, the academy says.

None of that is to suggest that children of single moms do not fare well, Yogman stressed. And, he said, the new report defines "father" in a broad sense not only the biological father who lives with a child.

It includes fathers who don't live with their children, grandfathers and any male figure who's invested in a child's well-being.

The report was published online June 13 in the journal Pediatrics.

The fact that dads matter is not new, but the report pulls together the growing body of research on fathers' impact, said Eric Lewandowski, a psychologist at NYU Langone's Child Study Center in New York City.

The report also encourages fathers to be involved as primary caregivers, and not just as "auxiliary" support, Lewandowski said.

Social shifts encourage dad's involvement

He also stressed that children without an involved father can and do "thrive." What's key, Lewandowski said, is that kids have their needs met, consistently and reliably.

There are signs that U.S. fathers are becoming more involved in child care, Yogman said. That's, in part, because the ranks of stay-at-home and single dads have grown.

In 2012, there were nearly 2 million single fathers in the United States — up 60 per cent from 10 years earlier, based on Census Bureau figures. The number of stay-at-home dads stood at 189,000 versus 98,000 a decade before.